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          大创结题的总结
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        <pre><code>每一段路都会决定未来的样子，大创结题了，总结留念</code></pre><a id="more"></a>
<h2 id="概述："><a href="#概述：" class="headerlink" title="概述："></a>概述：</h2><p>通过一年的学习与实践，收获了很多成长，创新创业项目也将要结束，从去年开始做调研到现在撰写总结报告，我作为项目负责人同时也是组内的一员，收获了很多课堂中接触不到的事情，不仅是单纯的动手实践能力，还收获了对一个科研项目从调研，到立项，再到展开研究以及结题的整个脉络的认识，同时也深刻认识到，创新不是立项立出来的，而是开展充分的实践做出来的，也认识到了团队合作的重要意义。</p>
<h2 id="承担的工作："><a href="#承担的工作：" class="headerlink" title="承担的工作："></a>承担的工作：</h2><p>在本次的项目中，我主要承担整个系统架构的设计和区块链方面的设计，以及项目的开发工作。在项目的调研阶段主要是学习区块链和访问控制的相关文献和书籍，认识到了许多访问控制模型。考虑他们和区块链技术结合的可行性以及结合的意义，最后选择利用自主访问控制模型和区块链结合，在选在区块链框架时，早期选择了hyperledger fabric框架，后来因为为了可以让访问控制和区块链这两种技术的结合过程更加的可自定义，重新设计了一个区块链框架，以更有效地结合访问控制和区块链技术。在系统整体架构上，早期拟打算使用C/S架构进行具体设计，在调研之后考虑到兼容性的问题改用了B/S架构。</p>
<p>在将访问控制结合到区块链后，毋庸置疑的解决了恶意篡改的问题，但是也导致整个系统相较于原本的单节点的访问控制系统，存在较大的系统延迟和资源浪费。为了解决这一问题，重新对区块链的结构进行了设计，将网络中的节点分为了SF节点和CI节点，SF节点负责向用户提供前端访问服务，区块链数据维护和响应功能，以及资源存储功能，CI节点只提供区块链数据维护和响应功能。借此降低整个系统的存储冗余和资源浪费。同时为了将访问控制的相关数据较好的存储到区块链中，设计了具体的区块结构，通过时间戳界定区块的生成时间先后，并用前后相连的哈希将区块链接成一条链，并将访问控制协议保存到区块体中。</p>
<p>每一个服务型系统，其响应速度都是极为重要的，越快速的响应有利于用户更好的体验，因此为了进一步提高请求访问权限的进行验证的响应速度，采取了用相对低成本的空间换时间的概念。通过在数据库中建立一张权限索引表，并将该表同步至各个节点，使得请求权限数据时可以通过要查询的对应文件和查询者，借助该表快速定位到保存对应权限数据的区块高度，以减少原本查找权限信息时逐个查找导致的时间浪费。</p>
<p>同时我还完成了系统前后端的开发工作，早期的开发选择了传统的JAVA+Tomcat的方式，但是为了使系统更加轻量级，我们用VUE和EXPRESS借助前后端分离的开发方式重新开发了整个系统，在当时对VUE框架和EXPRESS框架并不熟悉，学校也从未开设过相关课程，但是作为一名当代的大学生，自学能力是极为重要的。于是我通过网络查阅了相关的官方文档以及前辈们写过的优秀博客，对这两个框架有了初步的了解，随着进一步的开发遇到了诸多问题，印象最为深刻的就是JS作为单线程语言却可以异步执行，好几次都因为这一问题导致出现bug，但通过不断地查阅相关资料，也一个个的解决了这些相应的问题。</p>
<h2 id="收获："><a href="#收获：" class="headerlink" title="收获："></a>收获：</h2><p>一个人走过的每一段路都会决定这个人未来会成长成什么样子，在创新创业的训练过程中，遇到了很多问题，也有很多不如意与迷茫的时候，但自己还是坚持一路走到了最后，也庆幸自己努力走到了最后，一个人的成长必然是经历各种各样的问题和迷茫后才得以成长，这段经历必将是我大学生活中的宝贵记忆。勇往直前勇气的积攒和永不放弃精神的磨练是我在这一过程中最宝贵的收获，与此同时还有很多具体的收获。<br>从大一开始就解除了很多代币的当初对区块链技术略有耳闻，但当时只是浅薄的以为区块链技术就是电子货币技术，直到参与了大创项目，通过阅读大量的文献和资料以及相应的学科书籍，我才发现原来电子货币只是区块链技术衍生的一个具体产物而非技术本身，而区块链技术本身原来可以应用到这么多我们生活的实际场景中，不止我们所做的访问控制，还有与物联网的结合，与金融领域的结合，与物流链的结合等等。而推开区块链技术本身，其核心的哲理性思维更是给予了我诸多启发，当前世界形势下，全球化使得国家之间构成社区，企业之间构成社区，而在这里边国家之间的冲突，企业之间的冲突，在解决具体矛盾时能否从博弈状态转化为协商共赢的状态，共同维护的自身所处环境的良好向前发展。<br>其次是见知的增长和编程实践能力的增加，通过这次创新创业计划，我认识到了一个科研项目从立项到结束的整个过程，这也是一个产品从构思到产出的过程，以后不论是读研还是工作，这一见知都必将有很大的帮助。同时通过解决系统架构设计及开发过程中的问题，增长了很多响应的经验，明白了如果设计一个系统可以更有助于开发，有助于后期工作的良好开展。在编程能力上，除了除了java的web开发相关知识的增长外，最重要的是我从对VUE和EXPRESS这两个框架一无所知到现在可以用他们进行前后端分离的方式快速开发，这是我编程能力的巨大提升，同时也让我认识到官方文档是快速熟悉一个框架或语言的路径，而优秀前辈们的博客是提高相关技术的重要参考。<br>从头至尾，面临了许多问题，也解决了许多问题，一路走来收获能力，收获勇气，磨练精神，未来的日子里我将更加一往无前。向当代新中国新青年该有的奋发图强精神去靠拢。</p>

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